chore: include ignore_translation.toml in README sync commit (#3845)

# Description of Changes

- Updated the GitHub Actions workflow `.github/workflows/sync_files.yml`
to also include `scripts/ignore_translation.toml` in the automatic
commit step.
- This TOML file lists translatable strings that should be excluded
because they are explicitly marked as non-translatable.
- Including it in the sync ensures that cleanup of such excluded strings
is versioned together with README changes, improving consistency of
translation tooling automation.

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

.github/workflows/sync_files.yml

@@ -57,8 +57,8 @@ jobs:
 
       - name: Run git add
         run: |
-          git add README.md
-          git diff --staged --quiet || git commit -m ":memo: Sync README.md" || echo "No changes detected"
+          git add README.md scripts/ignore_translation.toml
+          git diff --staged --quiet || git commit -m ":memo: Sync README.md & scripts/ignore_translation.toml" || echo "No changes detected"
 
       - name: Create Pull Request
         if: always()